Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Engineering Mathematics Probability Measures of Dispersion
The mean and variance of a group of 100 observations are 8 and 9 respectively. 60 of these observations have mean 10 and standard deviation 2. Find the mean and variance of the remaining 40 observations.
1
mean = 5, variance = 2.5
2
mean = 2.5, variance = 5
3
mean = 5, variance = 1.5
4
mean = 1.5, variance = 5